caesiumclt is a powerful command-line tool for image compression written in Rust
Publisher’s description
What is CaesiumCLT?
CaesiumCLT by SaeraSoft is open-source Windows software in the archivers category. It ranks 44th by popularity among archivers in this catalogue. It is written in Rust.
Installation and requirements
The publisher provides Portable installers for 64-bit Windows. It runs without installation (portable).
Updates and version history
The current version is 1.5.0, released on September 16, 2026. The version history goes back to February 12, 2026: 3 releases, all linked to the official files.
Popularity and file types
The source code on GitHub (Lymphatus/caesium-clt) has 575 stars. Similar programs include 7-Zip, PeaZip and Zstandard.
Project description on GitHub: “Caesium Command Line Tools - Lossy/lossless image compression tool ”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Portable: runs without installation
- Updated in the last two months
Cons
- No native ARM64 build
In short: CaesiumCLT is an open-source archiver tool for 64-bit PCs.
Is CaesiumCLT safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
4D8469BE5D2C0FF07A08CC48A166F6130837C4CBD4CD77FA04CB9F25FD76B790· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 3 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 1.5.0Latest | September 16, 2026 | — | 64-bit ZIP |
| 1.4.0 | July 8, 2026 | — | 64-bit ZIP |
| 1.2.0 | February 12, 2026 | — | 64-bit ZIP |
Install from the command line
Silent install ›winget install --id SaeraSoft.CaesiumCLT -eRelated guide: How to use winget: install and update apps
Also for other systems
brew install caesiumcltInformation
- Publisher
- SaeraSoft
- Category
- Archivers
- Licence
- Apache License v2
- Price
- Free
- Source code
- github.com/Lymphatus/caesium-clt
- Written in
- Rust
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- Portable
- Version
- 1.5.0
- Released
- September 16, 2026
- Added to the catalogue
- February 12, 2026
- Versions listed
- 3
- GitHub stars
- 575
- GitHub forks
- 47
- Website
- github.com
- winget ID
- SaeraSoft.CaesiumCLT
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is CaesiumCLT free?
Yes. CaesiumCLT is open-source software under the Apache License v2 licence.
Is CaesiumCLT safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install CaesiumCLT with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does CaesiumCLT run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of CaesiumCLT?
The versions page lists all 3 versions with links to their official installer files, back to February 12, 2026.
Can I use CaesiumCLT without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to CaesiumCLT?
7-Zip, PeaZip, Zstandard, UPX and WinRAR. The alternatives page compares them.
